The report was based on 21 months of calls to its Modern Slavery Helpline since it launched in October 2016 up to June 2018.

The report says that car washes were the most common site of forced labour reported across all calls to the Helpline, comprising 23% of all potential victims indicated and 15% of all modern slavery cases.

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Andrew Wallis, CEO of Unseen, said: ‘With 99% of tip-offs coming in from the general public, and only 1% from victims self-reporting, this report underlines the crucial importance of everyone being able to both recognise the signs of slavery and exploitation and being willing to report.

Romanians were the nationality that had the most reports of being victims of slavery (Picture: Getty Images)

‘If you use a hand car wash and the people washing your car aren’t wearing any protective gear, if they’re withdrawn, unwilling to handle the money, and if the price seems too good to be true, that should ring alarm bells.’

11 cases indicating 69 potential victims came in through new ‘Safe Car Wash App’ launched by the Church of England in June 2018.

Justine Currell, Director of Unseen, said: ‘The Modern Slavery Helpline exists to help victims of trafficking escape exploitation, but we also exist to provide data and analysis on the nature and scale of modern slavery in this country, crucial to helping understand and fight this crime.